Those most common in Ceylon are the cocoa-nut and gingerly oils. The former is one of the grand staple commodities of the island; the latter is the produce of a small grain, grown exclusively by the natives.
But, in addition to these, there are various other oils manufactured by the Cingalese. These are the cinnamon oil, castor oil, margosse oil, mee oil, kenar oil, meeheeria oil; and both clove and lemon-grass oil are prepared by Europeans.
The first, which is the cinnamon oil, is more properly a kind of vegetable wax, being of the consistence of stearine. This is prepared from the berries of the cinnamon shrubs which are boiled in water until the catty substance or so-called oil, floats upon the surface; this is then skimmed off and, when a sufficient quantity is collected, it is boiled down until all watery particles are evaporated, and the melted fat is turned out into a shallow vessel to cool. It has a pleasant, though, perhaps, a rather faint aromatic smell, and is very delicious as an adjunct in the culinary art. In addition to this it possesses gentle aperient properties, which render it particularly wholesome.
Castor oil is also obtained by the natives by boiling, and it is accordingly excessively rank after long keeping. The castor-oil plant is a perfect weed throughout Ceylon, being one of the few useful shrubs that will flourish in such poor soil without cultivation.
Margosse oil is extracted from the fruit of a tree of that name. It has an extremely fetid and disagreeable smell, which will effectually prevent the contact of flies or any other insect. On this account it is a valuable preventive to the attacks of flies upon open wounds, in addition to which it possesses powerful healing properties.
Mee oil is obtained from the fruit of the mee tree. This fruit is about the size of an apricot, and is extremely rich in its produce; but the oil is of a coarse description, and is simply used by the natives for their rude lamps. Kenar oil and meeheeria oil are equally coarse, and are quite unfit for any but native purposes.
Lemon-grass oil, which is known in commerce as citronella oil, is a delightful extract from the rank lemon grass, which covers most of' the hillsides in the more open districts of Ceylon. An infusion of the grass is subsequently distilled; the oil is then discovered on the surface. This is remarkably pure, with a most pungent aroma. If rubbed upon the skin, it will prevent the attacks of insects while its perfume remains; but the oil is so volatile that the scent quickly evaporates and the spell is broken.
Clove oil is extracted from the leaves of the cinnamon tree, and not from cloves, as its name would imply. The process is very similar to that employed in the manufacture of citronella oil.
Cinnamon is indigenous throughout the jungles of Ceylon. Even at the high elevation of Newera Ellia, it is one of the most common woods, and it grows to the dimensions of a forest tree, the trunk being usually about three feet in circumference. At Newera Ellia it loses much of its fine flavor, although it is still highly aromatic.
This tree flourishes in a white quartz sandy soil, and in its cultivated state is never allowed to exceed the dimensions of a bush, being pruned down close to the ground every year. This system of close cutting induces the growth of a large number of shoots, in the same manner that withes are produced in England.